Drawing-pen.



No. 655,612. Patenfed Aug. 7, |900. J. M. DANNHEISER.

D H AW N G P E N.

(Application filed Oct. 25, 1899.)

(No Model.)

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IINiTnD STATES?? JOSEPH M. DAN NIIEISER, OF CHICAGO, ILLINOIS, ASSIGNOR TO TIIE EUGENE.

PATENT Omen.

DIETZGEN COMPANY, OF ILLINOIS;

DRAWING-PEN.'

SPECIFICATION forming part of Letters Patent No. 655,612, dated August 7, 1900.

Application filed October 25, 1899. Serial No. 7 34,706. (No model.)

To @ZZ whom it may conceive:

Be it known that I, JOSEPH M. DANNHEISER, a citizen of the United States, residing in the city of Chicago, county of Cook, and State of Illinois, have invented a new and useful Improvement in Drawing-Pens, of which the following is a specification.

M y invention relates to drawing-pens, more especially of the class of hinged ruling and compass pens, wherein the mutual approach of the blades is limited by a set-screw which serves as a stop or gage whereby the distance between said blades when closed in position for use may be predetermined, thus permitting the blades to be spread for cleaning or other purposes Without altering the adjustment thereof.

The objects of my invention are, first, to provide means for effecting a rigidity at the shanks and stocks of said blades when closed substantially equivalent to the rigidity which would result if the said shanks and stocks were solid and composed of a single piece; second, to provide means for preventing the accidental opening or spreading of the blades; third, to provide means whereby the blades may be caused to mutually approach or recede without the necessity of touching the set-screw or either of` the blades, thereby avoiding the liability of said blades to get out of adjustment by reason of accidental rotation of the set-screw; fourth, to obviate any danger of damaging the thread of the set-screw from the sudden approach of the blades, and, fifth, to provide the other details hereinafter set forth. I attain these objects by the mechanism illustrated in the accompanying drawings, in whichha n Figuresl and 2 are side views of a pen embodying my invention, Fig. l showing the operating-sleeve in a forward position and the blades in proximity, and Fig. 2 showing the said operating-sleeve retracted and the blades spread. Fig. Sis a top view of the pen as in Figs. l and 2 and shows a portion of the operating-sleeve broken away to reveal the blade-hinge. Fig. 4 is a perspective View of the iixed blade, showing the construction of the stock and shank thereof. Fig. 5 is a side view of a pen, showing a modification of the cam-and-pin feature of my invention. The

operating-sleeve, which is shown in vertical longitudinalV section for the purpose of rendering visible the inclosed parts, is in a forward position, and the blades are consequently in proximity. Fig. 6 is a top view of a pen embodying the modified cam-and-pin action as in Fig. 5. The operating-sleeve is in horizontal longitudinal section. Fig. '7 is a side view of the form of pen shown in Figs. 5 and 6. In Fig. 7 the operating-sleeve is in vertical longitudinal section and in a retracted position and the blades are spread.

Similar letters refer to similar parts throughout the'several views.

In Figs. l, 2, and 3, A represents a penhandle whereto the stock b of the fixed blade B is rigidly attached. Said stock b is preferably rectangular and serves as a guide for the operating-sleeve C, but said stock b and sleeve C may be cylindrical or of any other suitable configuration. The shank b of the fixed blade Bis preferably of reduced lateral thickness and forms a tongue whereto the swinging blade D is hinged. In said shank b', near the stock b of said iixed blade, is secured they pin b2, which serves as a pivot for the swinging blade D. The shank d of said blade D terminates at its upper extremity in the parallel arms or extensions d d', which are suitably apertured to receive the projecting extremities of the pin b2. Said extremities d d inclose the shank b of the blade B and in connection with said shank b/ and pin b2 constitute a hinge. The laterally-projecting operating-pins e e are rigidly attached to the forward portions of said extensions cl d and are intended to work within the oblique slots c c in the sleeve C. Said operating-sleeve C corresponds in cross-section to the stockb of the blade B and is of such dimension as to inclose said stock b and shank b of said blade B and also the adjacent extensions d CZ of Vthe blade D. Said sleeve is of sufficient size to move longitudinally over the parts inclosed therein, but binds said stock ZJ firmly enough to maintain any desired position thereon.l The slots c c are symmetrically located in preferably the forward portion of said sleeve C and form a cam for swinging the hinged blade D. The relative locations of the pins e e and slots c c are such that when the sleeve C occupies a forward position upon the pen, as shown in Fig. l, the said pins lie at the rear extremities of said slots and when said sleeve occupies a rear position, as shown in Fig. 2, the said pins lie at the forward extremities of said slots. The rear extremities of said slotsare lower than the forward extremities thereof, and therefore when the sleeve C is moved from a forward position upon the pen to a position farther to the rear thereon the pins e e are forced in an upward direction relatively to the hinge-pin h2 and other parts of the pen. As said pins e e are fixed upon the hinged blade D, the upward motion of said pins e e is imparted to said blade and the latter is swung upwardly upon its hinge.

The Obliquity or pitch of the slots c c is preferably very slight at the rear extremities of said slots in order that the swinging motion of the hinged blade D may be correspondingly slow as it nears the fixed blade B. This is an important feature, for it effectually prevents any damage which would occur to the thread of the set-screw if the blades came together suddenly and forcibly, as in the case of the employment of a spring to actuate the hinged blade.

The sleeve C is rigid, and as it when in a forward position completely incloses a portion of the stock b and the adjacent parts forming the hinge of the pen and as said parts t snugly within said sleeve it follows that when the blades are in proximity the shanks thereof are firmly held in position and are substantially as rigid as if formed of a single piece of material. This construction materially lessensthe danger of accidental spreading of the blades,which might occur when, as heretofore, a spring` is employed to hold the blades in proximity.

The set-screw E is carried by the hinged blade D, but may with equal propriety be carried by the fixed blade B. The extremity e of the threaded portion of saidvset-screw lies toward the inner faces of the blades, and when the blade D approaches the blade B said extremity e of the set-screw E comes into contact with the inner facepof said blade B and preventsfurther-approach. Byadjusting the position of said set-screw the distance between the blade-points may be adjusted. As the said set-screw is not employed to hold the blades in proximity7 the blades lnay be spread for cleaning or other purposes without changing the adjustment of said set-screw.

In the operation of the pen when the proper adjustment of the blades has been secured and it is desired to spread the blades apart the sleeve C is retracted and the blade D swings upwardly upon its hinges by reason of the action of the cam-surfaces of the slots c c upon the pins e e. When the blades are to bebrought into their former proximity, the sleeve C is moved forward and the blade D returns to its position near the blade B. As there is no occasion to touch the set-screw E,

essere the distance between the blade-points will be the same after the spreading of the blades as before the spreading.

The dierence between the pen above described and the modification thereof shown in Figs. 5, 6, and 7 lies in certain details of construction, as will hereinafter appear. In said Figs. 5, 6, and 7 the handle A and setscrew E are identical in purpose and construction with the handle A and set-screw E above described. The blade D is hinged to the fixed blade B/ by means of the hinge-pin f. The shank f of the blade D lies between the inclosing portions g g in the shank of the fixed blade B and has an oblique slot f2, which forms a cam for actuating the pin g'. Said portions g g are suitably slotted to permit the longitudinal motion of said pin g', which latter is rigidly fixed to the operating-sleeve C. The rear extremity of said slot f2 is raised, and the said shank and pin g are so relatively placed that said pin is adjacent to the rear extremity of said slot]L12 when the sleeve C is in a retracted position. Said sleeve C is partially cut away at the lower portion thereof, so as :not to interfere with the said shank f' of the blade D' when said blade .swingsvupon the pin f. Both the sleeve C and the sleeve C when in their forward positions fit snugly over the inclosed shanks of the pen-blades, and said sleeves not only hold said blade- Shanks rigid, but supplement thatpart of the cam action which effects the approach of the hinged to the xed blade.

In the operation of the modified form of pen the retraction of the sleeve C' moves the pin g' rearwardly, causing it to approach the raised rear extremity of the slot f2 in the shank f of the blade D'. This eects a relative lowering of the said rearA extremity of said shank f and a consequent raising of the forward pointed extremity of said blade.

It is evident that as the operating-sleeves have a closing action upon the pen-blades that portion of the surface of the-cams which effects the closure of said blades may be omitted without rendering the device inoperative. Other modifications will readily suggest themselves to those skilled in the art to which drawing-pens pertain. Any movable sleeve or casing capable of effecting a rigid connection between the blades of a drawing-pen and also capable of permitting the motion of said bladesrelatively to each other would lie within the spirit of my invention. Moreover, a pen wherein of three relatively-movable parts one has an irregular surface for acting` upon.

a port-ion of another of said parts, so as to change the distance between the points of the blades, would also be within the scope of my invention.

What I claim as new, and desire to secure by Letters Patent, is

l. In a drawing-pen, the combination of a sliding sleeve, a hinged blade, a fixed blade, and a cam-and-pin mechanism for swinging said hinged blade, said cam-and-pin mechan- IOO ism being operated by the longitudinal mo moving sleeve for operating said cam-and-pin xo tion of said sleeve. mechanism, and a portion at the upper oi' 2. In a drawing-pen the combination of a butt extremity of said hinged blade adapted hinged blade, pins attached to said blade, a toi-it snugly Within said sleeve and be rigidly longitudinally moving sleeve, and oblique held thereby.

slots Within said sleeve for engaging said pins. JOSEPH M. DANNHEISER.

3. In a drawing-pen, the combination of a Witnesses:

hinged blade, a cam-and-pin mechanism for MARY M. BAGHMAN,

swinging said hinged blade, a longitudinallyl ARTHUR M. COX. 

